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1. An Introduction to Pull-Off Adhesion on Coated Surfaces

Adhesion testers are used to test how well a coating has adhered to a surface, as poor adhesion can lead to premature coating failures. The coating inspector has essentially three main methods to choose from - cross hatch, push off, and the most common, the pull-off adhesion test.

This video is part of a series on Pull-Off Adhesion Testing, to see the next video pleaseclick here.

RELATED VIDEOS

1. An Introduction to Pull-Off Adhesion on Coated Surfaces

Adhesion testers are used to test how well a coating has adhered to a surface, as poor adhesion can lead to premature coating failures. The coating inspector has essentially three main methods to choose from - cross hatch, push off, and the most common, the pull-off adhesion test.

This video is part of a series on Pull-Off Adhesion Testing, to see the next video pleaseclick here.

When it comes to selecting the dolly diameter and adhesion gauge type to use for a pull-off adhesion test; factors such as the substrate material, the substrate shape, and the expected coating strength will affect the dolly or gauge the user chooses.

This video is part of a series on Pull-Off Adhesion Testing, to see the next video pleaseclick here.

When preparing a pull-off adhesion test, whilst the actual location and the number of pulls is typically defined by the test method or procedure that’s being followed, the actual positioning of the dolly is vital, as poor positions can result in low pull-off values or invalid tests.

This video is part of a series on Pull-Off Adhesion Testing, to see the next video pleaseclick here.

Once the pull-off adhesion test has been completed the tensile pull-off force, whether the coating was coat or not, the dolly size and gauge type, and the failure mode of the coating are all recorded; with the nature of the failure usually recorded as an estimated percentage to the nearest 10%.

This video is part of a series on Pull-Off Adhension Testing, to view the playlist please click here.

Testing coating adhesion on concrete substrates using a pull-off adhesion gauge is similar to testing coatings on metal substrates. However, there are a number of differences in the test procedures and equipment used.

This video is part of a series on Pull-Off Adhension Testing, to view the series playlist please click here.